ComputersDesktop
ASUS PN42 Computer Manual
Setup, everyday use, maintenance and troubleshooting for the desktop computer, with verified specifications.
- ProcessorIntel N200
- Memory16 GB
- Idle power6.7 W
- Est. yearly cost$5.36
About the ASUS PN42
ASUS model PN42 is a desktop computer that meets ENERGY STAR computer efficiency requirements.
The certified configuration includes an Intel N200 processor (4 cores, up to 3.7 GHz), 16 GB of memory, and SSD storage, running Windows 11 Pro. Retail configurations of the same model can differ, so check the system information on your unit.
Hardware listed in the certification record includes a 65 W external power adapter.
Its typical energy consumption (TEC) is 31.5 kWh per year, 33% below the ENERGY STAR limit of 46.9 kWh for its configuration. Measured idle power is 6.7 W, and sleep draws 2.7 W. The TEC figure is lower than 71% of the 285 Desktop models in our database.
Specifications
| Brand | ASUS |
|---|---|
| Model number | PN42 |
| Computer type | Desktop |
| Processor | Intel N200 |
| CPU cores | 4 |
| Base clock speed | 1.0 GHz |
| Maximum clock speed | 3.7 GHz |
| Neural processing unit (NPU) | No |
| Memory (as certified) | 16 GB |
| Storage type | SSD |
| Installed storage drives | 1 |
| Operating system | Windows 11 Pro |
| Touch screen | No |
| Power adapter rating | 65 W |
| Energy Efficient Ethernet | Yes |
| Default low-power mode | Modern Standby |
| Sleep timer (as shipped) | 5 min |
| Display-off timer (as shipped) | 5 min |
| Short-idle power | 6.7 W |
| Long-idle power | 2.7 W |
| Sleep power | 2.7 W |
| Off power | 0.7 W |
| Typical energy consumption (TEC) | 31.5 kWh/yr |
| ENERGY STAR TEC limit | 46.9 kWh/yr |
| Below ENERGY STAR limit | 33% |
Safety information
- Use the 65 W power adapter supplied with the computer, or a replacement from the manufacturer with the same voltage and an equal or higher wattage rating. Inspect the cord regularly and replace it if the insulation is damaged.
- Shut down and unplug the computer before opening the case. Touch a bare metal part of the chassis (or wear an antistatic wrist strap) before handling memory, drives or expansion cards.
- Keep liquids away from the keyboard and vents. If liquid is spilled, shut down immediately, unplug the power and let the computer dry completely before restarting.
Setup
- Unpack and inspect
Remove all packaging, protective film and cardboard inserts. Keep the box and receipt until you are sure the computer works correctly.
- Choose a location
Place the system unit on a stable surface or the floor with at least 4 in. (10 cm) of clearance around the vents. Avoid enclosed desk cabinets and carpet, which restrict airflow and collect dust.
- Connect a monitor
Connect your monitor to a video output on the back panel using HDMI, DisplayPort or USB-C as available.
- Connect peripherals and network
Connect the keyboard, mouse and any USB devices. For the most reliable connection, plug an Ethernet cable into the network port. Then connect the power cord.
- Complete operating system setup
Follow the Windows setup screens to choose your region, connect to Wi-Fi and sign in. Then open Settings > Windows Update and install all available updates, including optional driver and firmware updates.
- Update firmware and drivers
Use the manufacturer's update utility or support page to install the latest BIOS/UEFI firmware and chipset drivers. Keep the computer plugged in during firmware updates.
- Set up backups
Turn on cloud sync or connect an external drive and schedule automatic backups before you store important files on the computer.
Using your computer
Sleep and power settings
As shipped, the ASUS PN42 turns off its display after 5 minutes of inactivity and goes to sleep after 5 minutes. Keeping these timers short is the easiest way to save energy. Its default low-power state is Modern Standby, which keeps the network alive at very low power so email and updates can sync and the computer wakes instantly. If the battery drains noticeably in a bag, use Hibernate or Shut down for travel. Measured sleep power is 2.7 W, compared with 6.7 W when idle with the screen on.
Performance
With 16 GB of memory, the system handles typical office multitasking, browsing with many tabs and light creative work comfortably. Solid-state storage needs no defragmenting; leave 10–20% of the drive free so it can maintain performance.
Networking
Wired Ethernet is supported. Energy Efficient Ethernet (IEEE 802.3az) lowers link power during quiet periods when the switch also supports it.
Care and maintenance
| When | What to do |
|---|---|
| Weekly | Restart the computer to apply pending updates and clear memory; confirm that backups completed. |
| Monthly | Install operating system and application updates. Wipe the keyboard, mouse and case with a soft, slightly damp microfiber cloth (power off first). |
| Every 3–6 months | With the computer shut down and unplugged, clear dust from the front and rear vents and, if comfortable, inside the case around fans and heat sinks. |
| Every 6–12 months | Check for BIOS/UEFI firmware updates from the manufacturer and review storage health and free space. |
Troubleshooting
Start with the simple checks below. For beep codes, diagnostic lights or error messages specific to this model, use the manufacturer's built-in diagnostics and support documentation.
| Problem | Possible cause | What to try |
|---|---|---|
| Will not turn on | Power cord or outlet; power strip switched off. | Check the outlet and power strip, reseat the power cord, then hold the power button for 15 seconds and try again. |
| Runs hot or the fan is loud | Dust-clogged vents; blocked airflow; heavy background task. | Clean the vents, keep 4 in. of clearance around the case, and check Task Manager for apps using a lot of power. |
| Slow performance | Too many background apps; storage nearly full; pending updates. | Close or disable unneeded startup items, free up storage space, install updates and restart. |
| Will not wake from sleep | Software or firmware issue; accessory preventing wake. | Press the power button briefly; update chipset, graphics and firmware; disconnect USB devices to test. |
| Wi-Fi drops or is slow | Weak signal; outdated software; router issue. | Move closer to the router, update the network driver, and restart the router. |
| Battery drains while asleep | Connected standby activity; an app preventing low-power idle. | Use Hibernate for long periods away; review the sleep/battery report and close apps that keep the system awake. |
| No picture on the monitor | Wrong monitor input; loose cable. | Select the correct input on the monitor and reseat the video cable. |
Energy use and running costs
The ASUS PN42 has a typical energy consumption (TEC) of 31.5 kWh per year, about $5.36 a year at $0.17 per kWh. TEC combines the measured off, sleep and idle power with ENERGY STAR's standard assumptions about how many hours a year a desktop spends in each state. It does not include time under heavy load such as gaming, rendering or video export, which can draw several times the idle figure.
| Power state | Measured power |
|---|---|
| Short idle (on, screen on, nothing running) | 6.7 W |
| Long idle (display off) | 2.7 W |
| Sleep | 2.7 W |
| Off (plugged in) | 0.7 W |
Sleep settings matter: leaving the computer on and idle for the 16 hours a day you are not using it adds about 39.1 kWh ($6.65) a year, versus 15.8 kWh ($2.68) if it sleeps during those hours.
Frequently asked questions
What processor and memory does the ASUS PN42 have?
The certified configuration has an Intel N200 processor with 4 cores (up to 3.7 GHz) and 16 GB of RAM. Other retail configurations may differ.
How much electricity does the ASUS PN42 use?
Its ENERGY STAR typical energy consumption is 31.5 kWh per year — about $5.36 at $0.17/kWh. It draws 6.7 W at idle and 2.7 W in sleep.
What operating system does the ASUS PN42 run?
It was certified with Windows 11 Pro.
Does the ASUS PN42 have an NPU for AI features?
The certification record does not list an installed NPU for this configuration. If on-device AI features matter to you, check the processor specifications for your exact unit.
What charger does the ASUS PN42 use?
It ships with a 65 W external power adapter. Replacements should match the voltage and connector and be rated for at least 65 W.
Sources and disclaimer
Specifications on this page come from the ENERGY STAR certified computers dataset published by the U.S. Environmental Protection Agency (record certified June 9, 2025), retrieved October 7, 2026.
The setup, operating, maintenance and troubleshooting guidance is written by ManualHarbor's editors for this specific product type and configuration. It is an independent guide — not a reproduction of the manufacturer's manual — and ManualHarbor is not affiliated with ASUS. Always follow the safety instructions, installation requirements and warranty terms supplied with your unit, and contact ASUS or an authorized service provider for warranty repairs and replacement parts.
Running-cost figures use assumed U.S. average utility prices and are estimates for comparison only. See our editorial methodology for details.
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